I've been telling everyone I know that I'm thinking of covering the scar down the middle of my chest with a tattoo of a zipper. So far only my surgeon has laughed.
Because I'm not a tattoo kind of guy, I used the idea as fodder for the opening of a story. Of course, before the first paragraph ends "Zipper" kills a guy. I managed to write almost three pages beyond that point, and I think the character has potential, but I've not yet figured out the rest of the story.